Table of Contents
- 1 What is data transfer instructions?
- 2 Which instruction is a data transfer instruction?
- 3 What are the type of instructions in a 8051 microcontroller?
- 4 What is types of instruction?
- 5 What is data transfer in microprocessor?
- 6 What is data transfer group?
- 7 How many types of instructions are there in 8051?
- 8 What are different types of instructions?
- 9 How are the instructions specified in the 8051 instruction set?
- 10 Where is the data stored in the 8051?
What is data transfer instructions?
The data transfer instructions move data between memory and the general-purpose and segment registers, and perform operations such as conditional moves, stack access, and data conversion.
Which instruction is a data transfer instruction?
- 1) MOV. This instruction simply copies the data from the source to the destination.
- 2) PUSH. This instruction is used to push data into the stack.
- 3) POP. This instruction is used to get the data from the stack.
- 4) XCHG. It exchanges the contents of the source and the destination.
- 5) LAHF.
- 6) SAHF.
- 7) IN.
- 8) OUT.
What are the control transfer instructions in 8051?
A Brief Look at 8051 Microcontroller Instructions and Groups
| DATA TRANSFER | ARITHMETIC | BOOLEAN |
|---|---|---|
| MOV | ADD | CLR |
| MOVC | ADDC | SETB |
| MOVX | SUBB | MOV |
| PUSH | INC | JC |
What are the type of instructions in a 8051 microcontroller?
The instruction set of microcontroller 8051 can be divided into the following groups: Data transfer instructions. Arithmetic instructions. Logical Instructions (Boolean).
What is types of instruction?
Depending on operation they perform, all instructions are divided in several groups:
- Arithmetic Instructions.
- Branch Instructions.
- Data Transfer Instructions.
- Logic Instructions.
- Bit-oriented Instructions.
What is instruction and data?
Instructions tell the programme what to do and is usually stored in the . text portion of the binary. Data is what the programme works on and mainly consists of the heap and stack stored in different parts of the memory.
What is data transfer in microprocessor?
Using the IN and OUT instructions, data transfer is carried out between the microprocessor and I/O devices. The processor reads the data from an input port or input device using the IN command. The processor sends data out from the CPU to the output port or the output device using the OUT instruction.
What is data transfer group?
This group of instructions copy data from a location called a source to another location called a destination, without modifying the contents of the source. In technical manuals, the term data transfer is used for this copying function.
What are the data transfer instructions in 8085 microprocessor?
Data transfer instructions in 8085 microprocessor
| OPCODE | OPERAND | EXPLANATION |
|---|---|---|
| STA | 16-bit address | contents at address = A |
| LHLD | 16-bit address | directly loads at H & L registers |
| SHLD | 16-bit address | directly stores from H & L registers |
| LXI | r.p., 16-bit data | loads the specified register pair with data |
How many types of instructions are there in 8051?
All commands are known as INSTRUCTION SET. All microcontrollers compatibile with the 8051 have in total of 255 instructions, i.e. 255 different words available for program writing.
What are different types of instructions?
What are data transfer instructions in 8051 microcontroller?
The 8051 microcontroller has an 8-bit opcode which gives it the ability to handle 2^8 (255) instructions. The operands, on the other hand, can be of 0 bytes, 1 byte or 2 bytes. In this article, we will be talking about the data transfer instructions in 8051 that are a subset of the instructions it offers.
How are the instructions specified in the 8051 instruction set?
The 8051 instructions are specified with opcode, operand, size in bytes, M-cycle (number of machine cycles) etc. Here one machine cycle consists of 12 oscillator periods. Following table-1 mentions meanings of terms used in the instructions mentioned in the other tables along with addressing modes.
Where is the data stored in the 8051?
After incrementing the address in the stack pointer, data is placed at that memory location. For example, when the 8051 is powered up, it holds the address 07H. When it receives the first PUSH instruction, the address is updated to 08H, and data is stored in that location. The POP operation is used to extract data that is stored in the stack.
What are the opcodes and operands of the 8051?
The opcode is responsible for telling the microcontroller what to do, whereas the operand holds the data on which the operations are to be performed. The 8051 microcontroller has an 8-bit opcode which gives it the ability to handle 2^8 (255) instructions. The operands, on the other hand, can be of 0 bytes, 1 byte or 2 bytes.